What is 16Mo3 equivalent material?
EN 16Mo3 steel is mainly used for pressure vessels and boilers working at elevated working temperatures. EN 16Mo3 equivalent ASME material is SA204 Gr B steel, which has similar chemical composition and mechanical properties with EN 16Mo3 steel.
6Mo3 is an EN 10028-2 chromium-molybdenum alloy steel (Werkstoff 1.5415) for high-temperature industrial service. It is suitable for boilers, pressure vessels, heat exchangers, and pipelines. Maintaining mechanical strength and creep resistance up to 500–600°C, it is available as plates, sheets, and fittings. Its weldability and formability make it ideal for oil, gas, chemical, and power industries.
Key Characteristics
Alloying Elements: Chromium improves corrosion and oxidation resistance; molybdenum boosts creep resistance.
Mechanical Performance: Strong tensile and yield strength for high-temperature applications.
Weldability: Low carbon equivalent enhances weld quality.
Operational Stability: Resists scaling, deformation, and fatigue under steam or chemical exposure.
Decoding the Name
"16" ≈ 0.16% carbon
"Mo" = molybdenum for creep and oxidation resistance
"3" = EN series number
Indicates low-alloy steel designed for high-temperature pressure service.
Comparison
10CrMo9-10 higher chromium → superior oxidation resistance at very high temperatures.
16Mo3 more cost-effective for standard high-temperature boilers (~500–600°C).
10CrMo9-10 selected for severe steam and chemical service above 550°C.
Both low-alloy steels for welded pressure vessels and heat exchangers.
Common Applications
Industrial boilers and superheaters
Heat exchangers and reheaters in chemical and oil plants
High-temperature pipelines
Pressure vessels in power generation and petrochemical industries
How does chromium improve 16Mo3?
Chromium enhances oxidation and corrosion resistance at elevated temperatures. It protects against scaling and surface degradation in steam and flue gas environments. Combined with molybdenum, it ensures that 16Mo3 maintains mechanical stability, creep resistance, and long-term reliability in boilers, pipelines, and pressure vessels.
Can 16Mo3 be used in superheated steam?
Yes, 16Mo3 is specifically suited for superheated steam environments in boilers and power plants. Its high creep strength, oxidation resistance, and microstructural stability allow long-term exposure to high-temperature steam without deformation or scaling, ensuring safe and efficient operation of superheater tubes and pipelines.
What welding consumables are recommended for 16Mo3?
Low-hydrogen electrodes or filler metals matching base steel properties are recommended. Proper preheating, welding technique, and post-weld heat treatment maintain toughness and creep strength. Selection depends on plate thickness, joint design, and applicable standards, ensuring reliable fabrication for boilers, pipelines, and heat exchangers.
Chemical composition % of steel 16Mo3 (1.5415): EN 10028-2-2003
| C | Si | Mn | Ni | P | S | Cr | Mo | N | Cu |
| 0.12 - 0.2 | max 0.35 | 0.4 - 0.9 | max 0.3 | max 0.025 | max 0.01 | max 0.3 | 0.25 - 0.35 | max 0.012 | max 0.3 |
Mechanical properties of steel 16Mo3 (1.5415)
| Nominal thickness (mm): | to 60 | 60 - 100 | 100 - 150 | 150 - 250 |
| Rm - Tensile strength (MPa) (+N) | 440-590 | 430-580 | 420-570 | 410-570 |
| Nominal thickness (mm): | to 16 | 16 - 40 | 40 - 60 | 60 - 100 | 100 - 150 | 150 - 250 |
| ReH - Minimum yield strength (MPa) (+N) | 275 | 270 | 260 | 240 | 220 | 210 |
| KV - Impact energy (J) transverse, (+N) | +20° 27 |
| KV - Impact energy (J) longitud., (+QT) | +20° 50 |
| KV - Impact energy (J) transverse, (+QT) | +20° 34 |
| KV - Impact energy (J) longitud., | +20° 4 |
| A - Min. elongation at fracture (%) longitud., (+QT) | 23 |
| A - Min. elongation at fracture (%) transverse, (+N) | 20 |
1. What makes 16Mo3 suitable for high-temperature service?
16Mo3 contains chromium and molybdenum, which provide excellent creep resistance, oxidation protection, and high tensile strength at temperatures up to 500–600°C. Its microstructure remains stable under prolonged thermal stress, making it ideal for industrial boilers, superheater tubes, heat exchangers, and pipelines. It is also weldable and formable for long-term reliability.
2. Can 16Mo3 be normalized?
Yes, normalizing at 890–950°C refines the grain structure and enhances mechanical properties. This treatment improves tensile and yield strength, creep resistance, and toughness, making 16Mo3 suitable for high-temperature service in boilers, pipelines, heat exchangers, and pressure vessels. Controlled cooling prevents residual stresses and ensures dimensional stability.
3. Is 16Mo3 suitable for pipelines?
Yes, 16Mo3 is ideal for high-temperature pipelines transporting steam, hot water, or process fluids. Its creep resistance, tensile strength, and oxidation resistance ensure reliability under long-term thermal stress. Welded or flanged connections maintain integrity, making it widely used in oil, gas, chemical, and power generation industries.
4. Can 16Mo3 handle high-pressure boilers?
Yes, 16Mo3 is used for high-pressure and high-temperature boilers. Its combination of tensile strength, yield strength, creep resistance, and oxidation resistance ensures safe operation. Proper design, welding, and heat treatment allow it to withstand internal pressures and continuous thermal stress in industrial applications.
5. What temperature range is suitable for 16Mo3?
16Mo3 is suitable for continuous service at 500–600°C. Exceeding this temperature may reduce mechanical properties or cause oxidation and creep-related issues. Proper fabrication, welding, and heat treatment ensure structural integrity in boilers, pipelines, and superheater tubes operating within the recommended temperature range.
6.How does 16Mo3 resist thermal fatigue?
16Mo3 resists thermal fatigue due to its molybdenum content, which boosts high-temperature strength, creep resistance, and oxidation resistance, allowing it to maintain structural integrity and ductility under thermal stress in applications like boilers and pressure vessels, preventing premature failure from repeated heating and cooling cycles.
7. Does 16Mo3 require preheat before welding?
Yes, preheating to 150–250°C is recommended, depending on thickness. It reduces hydrogen-induced cracking and ensures proper weld penetration and mechanical property retention. Preheating, combined with PWHT, allows reliable fabrication of boilers, pipelines, and pressure vessels without compromising high-temperature performance.
If you have project requirements for 16Mo3 , we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email: info@gneesteels.com
